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Math Help - probability

  1. #1
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    probability

    An elevator with two passengers stops at the second, third, and fourth floors. If it is equally likely that a passenger gets off at any of the three floors, what is the probability that the passengers get off at different floors?
    Thanks.
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  2. #2
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    Quote Originally Posted by jojo_jojo View Post
    An elevator with two passengers stops at the second, third, and fourth floors. If it is equally likely that a passenger gets off at any of the three floors, what is the probability that the passengers get off at different floors?
    Thanks.
    Pr(passengers get off at different floors) = 1 - Pr(passengers get off at the same floor).
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  3. #3
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    Pr(passengers get off at different floors) = 1 - Pr(passengers get off at the same floor)
    So, Pr(passengers get off at the same floor) = 2/6
    Therefore, 1 -2/6 = 4/6 = 2/3
    Last edited by ThePerfectHacker; March 26th 2009 at 07:48 AM.
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